Mail error RRS feed

  • Question

  • Hello

    We have trubble with our mail server. We have another server, When they try to e-mail us at they recieve the following error massage: 

    This is the mail system at host I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message.

    The mail system


     <>: host[] said: 550 5.7.1 Unable to relay (in reply to RCPT TO command)

    Can you please help me find this error. It's only the reciever that fails, so we suppose the error is witihn this server, and incomming e-mail.

    Sincerely Johanna Andersson, +46 76 112 12 57

    Wednesday, April 9, 2014 11:11 AM


  • "Unable to relay" message is mostly related to the fact that an email system receives an external message (not from own domain) and due to some rooting configuration is supposed to send this message again to some external address. To avoid using this system as relay for mass mailing/ spamming, such Messages are being blocked internally.
    Examine your email rooting configuration to find out what is happening exactly.
    Wednesday, April 9, 2014 11:40 AM